Re: [pygame] more list problems

[DR0ID <dr0id@xxxxxxxxxx>]

Eric Hunter schrieb:
> so I have been able to write pygame.Rect rectangles into rect-type 
> lists. but now I'm trying to delete unwanted rectangles that are 
> printed to the screen.
>
> when I draw one at a time, I can only delete the last drawn rectangle 
> before deleting the previous ones. I want to be able to delete any 
> rectangle at any time without problems. I've come close but have run 
> into a wall.
>
> below is the "deleting rect" section. if anyone needs more then what's 
> provided i can provide it upon request.
>
> thanks in advance.
>
> [code]
> if event.button == 3:
>                                 mousexTEMP, mouseyTEMP = 
> pygame.mouse.get_pos()
>                                 for i in range(0, len(rect)):
>                                     if 
> rect[i].collidepoint(mousexTEMP, mouseyTEMP):
>                                             del rect[i]   
>                                                 numRect -= 1
> [/code]

Hi

1. use event.pos to get the mouseposition
2. be always carefull when deleting from a list while iterating over it
3. normally use a plural form for a list: rects = [] # list of rectangles

Here, how I would do it. It deletes all rects colliding with the mouse 
position (untested code):

[code]
if event.button == 3:
   mouserect = pygame.Rect(event.pos, (1, 1)) # perhaps a Rect(pos, 
(0,0)) would work too
                                                                       
# since you actually want 1 pixel size
   i = mouserect.collidelist(rects)
   while i != -1:
        del rects[i]
        i = mouserect.collidelist(rects)
   numRect = len(rects) # really needed?

[/code]


I hope that helps.

~DR0ID